Feature: 1. Independent Control: Independent switch for each channel, independent volume adjustment for each channel. Users can control each signal independently and adjust the volume flexibly according to their needs. 2. Bipolar Independent Circuit: All 4 inputs are designed with bipolar independent circuits to ensure no interference, no sound coloration. Even if an input device with a common ground interference, it will not affect the other signals. 3. 4 IN 2 OUT: This non interference multi input and multi output mixer supports 4 signal inputs and 2 signal outputs, 4 volume switches, stereo and mono channel inputs can be flexibly adjusted. 4. MATERIAL CRAFT: The all aluminum CNC shell is processed by anodic oxidation brushed process, which is not easy to lose paint, not fade, not easy to get rusty, and also increases the strength of shielding signal interference. 5. STEREO, MONO CHANNEL SWITCHING: Stereo mono channel switch to the left to switch to stereo input, to the right to switch to mono channel input, to meet different needs. Specification: Item Type: Sound Mixer Material: Aluminum Alloy Input Signal: 4 Channel Stereo, Mono Signal Output Signal: 2 Channel Stereo Signal Input Impedance: 47KΩ Output Impedance: 600Ω Frequency Response: 20Hz-20kHz Signal To Noise Ratio: 96.86db (20Hz-20kHz) Operating Voltage: DC5V. Package List: 1 x Sound Mixer1 x USB Cable1 x Instruction Manual Note: Please choose your own USB adapter (5V) or other means of power supply such as power bank, the product is only equipped with a power supply cable.